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cje ›› 2004, Vol. ›› Issue (3): 24-29.

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Compensatory effects of re-watering on summer maize threatened by water stress at seedling period

LIU Gengshan, GUO Anhong, REN Sanxue, AN Shunqing, ZHAO Huarong   

  1. Institute of Eco-environment and Agro-meteorology, Chinese Academy of Meteorological Science, Beijing 100081, China
  • Received:2003-03-17 Revised:2003-06-05 Online:2004-06-10

Abstract: Based on the theory of crop Regulated Deficit Irrigation (RDI), field experiments on compensatory effects of re-watering at jointing stage for summer maize threatened by water stress at seedling period were carried out.The results showed that re-watering can increase the stomatal conductance, photosynthesis rate, and WUE (Pn/Tr).The compensatory effect was evident.Two days after re-watering, the stomatal conductance and photosynthesis rate recorered to the level of CK.Sometimes in the morning and the whole afternoon, the "over-compensatory " effect under re-watering treatment was significant.In addition, the plant height, leaf area, shoot and root biomass of summer maize can improve to the plant growth status under well irrigation treatment.Thus, the yield and yield factors were close to the CK.The WUE (Y/ET) was improved to 24.7% significantly.It provided a theoretical reference for water management and improving water use efficiency of summer maize, and also provided a simple irrigation method that can be operated by farmers easily.

Key words: Carbon flux, Correction method, Tropical seasonal rainforest

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